> So, it could be the i40e driver then ? Because IIUC, VFs use a separate > driver. Just to rule out the possibility that there might be some driver fixes that > could help with this, it might be a good idea to try a 3.19 or later upstream > kernel. > I tried with the latest DPDK release too (dpdk-1.8.0) and see the same issue. As mentioned earlier, i do not see any issues at all when running tests using either i40e or dpdk on the host itself. This is the reason why i am suspecting if it is anything to do with KVM/libvirt. Both with regular PCI passthrough and VF passthrough i see issues. It is always pointing to some issue with packet transmission. Receive seems to work ok. On Thu, Mar 12, 2015 at 8:02 PM, Bandan Das <bsd@xxxxxxxxxx> wrote: > jacob jacob <opstkusr@xxxxxxxxx> writes: > >> On Thu, Mar 12, 2015 at 3:07 PM, Bandan Das <bsd@xxxxxxxxxx> wrote: >>> jacob jacob <opstkusr@xxxxxxxxx> writes: >>> >>>> Hi, >>>> >>>> Seeing failures when trying to do PCI passthrough of Intel XL710 40G >>>> interface to KVM vm. >>>> 0a:00.1 Ethernet controller: Intel Corporation Ethernet >>>> Controller XL710 for 40GbE QSFP+ (rev 01) >>> >>> You are assigning the PF right ? Does assigning VFs work or it's >>> the same behavior ? >> >> Yes.Assigning VFs worked ok.But this had other issues while bringing down VMs. >> Interested in finding out if PCI passthrough of 40G intel XL710 >> interface is qualified in some specific kernel/kvm release. > > So, it could be the i40e driver then ? Because IIUC, VFs use a separate > driver. Just to rule out the possibility that there might be some driver fixes that > could help with this, it might be a good idea to try a 3.19 or later upstream > kernel. > >>>> From dmesg on host: >>>> >>>>> [80326.559674] kvm: zapping shadow pages for mmio generation wraparound >>>>> [80327.271191] kvm [175994]: vcpu0 unhandled rdmsr: 0x1c9 >>>>> [80327.271689] kvm [175994]: vcpu0 unhandled rdmsr: 0x1a6 >>>>> [80327.272201] kvm [175994]: vcpu0 unhandled rdmsr: 0x1a7 >>>>> [80327.272681] kvm [175994]: vcpu0 unhandled rdmsr: 0x3f6 >>>>> [80327.376186] kvm [175994]: vcpu0 unhandled rdmsr: 0x606 >>> >>> These are harmless and are related to unimplemented PMU msrs, >>> not VFIO. >>> >>> Bandan >> -- >> To unsubscribe from this list: send the line "unsubscribe kvm" in >> the body of a message to majordomo@xxxxxxxxxxxxxxx >> More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
